Hostile Territory

 https://www.bbc.com/safety/safetyguides/highrisk/hostile-environments 

Hostile territory, in the context of the United Nations, typically refers to areas under military occupation or control by a foreign power during armed conflict. International humanitarian law governs the treatment of such territories, emphasizing the protection of civilians and the responsibilities of the occupying power. 

https://guide-humanitarian-law.org/content/article/3/occupied-territory/